compilers/rustc-riscv32i.patch

@@ -0,0 +1,67 @@
+commit 23c32a1597df69083f4fa6fb932410cb342e266e
+Author: Sebastien Bourdeauducq <sb@m-labs.hk>
+Date:   Tue Apr 9 00:15:31 2019 +0800
+
+    add riscv32i
+
+diff --git a/src/librustc_target/spec/mod.rs b/src/librustc_target/spec/mod.rs
+index 46fefd78f4..181342db7d 100644
+--- a/src/librustc_target/spec/mod.rs
++++ b/src/librustc_target/spec/mod.rs
+@@ -465,6 +465,7 @@ supported_targets! {
+     ("aarch64-unknown-hermit", aarch64_unknown_hermit),
+     ("x86_64-unknown-hermit", x86_64_unknown_hermit),
+ 
++    ("riscv32i-unknown-none-elf", riscv32i_unknown_none_elf),
+     ("riscv32imc-unknown-none-elf", riscv32imc_unknown_none_elf),
+     ("riscv32imac-unknown-none-elf", riscv32imac_unknown_none_elf),
+     ("riscv64imac-unknown-none-elf", riscv64imac_unknown_none_elf),
+diff --git a/src/librustc_target/spec/riscv32i_unknown_none_elf.rs b/src/librustc_target/spec/riscv32i_unknown_none_elf.rs
+new file mode 100644
+index 0000000000..a015e16d93
+--- /dev/null
++++ b/src/librustc_target/spec/riscv32i_unknown_none_elf.rs
+@@ -0,0 +1,31 @@
++use crate::spec::{LinkerFlavor, LldFlavor, PanicStrategy,
++           Target, TargetOptions, TargetResult};
++
++pub fn target() -> TargetResult {
++    Ok(Target {
++        data_layout: "e-m:e-p:32:32-i64:64-n32-S128".to_string(),
++        llvm_target: "riscv32".to_string(),
++        target_endian: "little".to_string(),
++        target_pointer_width: "32".to_string(),
++        target_c_int_width: "32".to_string(),
++        target_os: "none".to_string(),
++        target_env: String::new(),
++        target_vendor: "unknown".to_string(),
++        arch: "riscv32".to_string(),
++        linker_flavor: LinkerFlavor::Lld(LldFlavor::Ld),
++
++        options: TargetOptions {
++            linker: Some("rust-lld".to_string()),
++            cpu: "generic-rv32".to_string(),
++            max_atomic_width: Some(32),
++            atomic_cas: true,
++            features: "-m,-a,-c".to_string(),
++            executables: true,
++            panic_strategy: PanicStrategy::Abort,
++            relocation_model: "static".to_string(),
++            emit_debug_gdb_scripts: false,
++            abi_blacklist: super::riscv_base::abi_blacklist(),
++            .. Default::default()
++        },
++    })
++}
+diff --git a/src/tools/build-manifest/src/main.rs b/src/tools/build-manifest/src/main.rs
+index 61cc78ad80..4364ef41f9 100644
+--- a/src/tools/build-manifest/src/main.rs
++++ b/src/tools/build-manifest/src/main.rs
+@@ -92,6 +92,7 @@ static TARGETS: &[&str] = &[
+     "powerpc-unknown-linux-gnu",
+     "powerpc64-unknown-linux-gnu",
+     "powerpc64le-unknown-linux-gnu",
++    "riscv32i-unknown-none-elf",
+     "riscv32imc-unknown-none-elf",
+     "riscv32imac-unknown-none-elf",
+     "riscv64imac-unknown-none-elf",

default.nix

@@ -16,11 +16,10 @@ rec {
 
     heavycomps = pkgs.callPackage ./heavycomps.nix { inherit nmigen; };
 
-    binutils-riscv32 = pkgs.callPackage ./compilers/binutils.nix { platform = "riscv32"; };
+    binutils-riscv = pkgs.callPackage ./compilers/binutils.nix { platform = "riscv32"; };
-    binutils-riscv64 = pkgs.callPackage ./compilers/binutils.nix { platform = "riscv64"; };
     rust-riscv32imc-crates = pkgs.callPackage ./compilers/rust-riscv32imc-crates.nix { };
 
-    fw-helloworld = pkgs.callPackage ./firmware { inherit rust-riscv32i-crates binutils-riscv32; };
+    fw-helloworld = pkgs.callPackage ./firmware { inherit rust-riscv32imc-crates binutils-riscv; };
   };
   lib = {
     symbiflow = import ./eda/symbiflow.nix { inherit pkgs; inherit (drvs) yosys; };

firmware/default.nix

@@ -1,4 +1,4 @@
-{ rustPlatform, rust-riscv32i-crates, binutils-riscv32 }:
+{ rustPlatform, rust-riscv32imc-crates, binutils-riscv }:
 
 rustPlatform.buildRustPackage rec {
   name = "helloworld";
@@ -9,14 +9,14 @@ rustPlatform.buildRustPackage rec {
 
   buildPhase = ''
     export CARGO_HOME=$(mktemp -d cargo-home.XXX)
-    export RUSTFLAGS="-L ${rust-riscv32i-crates}/lib/rustlib/riscv32i-unknown-none-elf/lib -C linker=${binutils-riscv32}/bin/riscv32-unknown-elf-ld -C link-arg=-Tlink.x"
+    export RUSTFLAGS="-L ${rust-riscv32imc-crates}/lib/rustlib/riscv32imc-unknown-none-elf/lib -C linker=${binutils-riscv}/bin/riscv32-unknown-elf-ld -C link-arg=-Tlink.x"
     cargo build --release --target riscv32imc-unknown-none-elf
   '';
 
   doCheck = false;
   installPhase = ''
     mkdir -p $out
-    cp target/riscv32i-unknown-none-elf/release/helloworld $out
+    cp target/riscv32imc-unknown-none-elf/release/helloworld $out
-    ${binutils-riscv32}/bin/riscv32-unknown-elf-objcopy -O binary target/riscv32i-unknown-none-elf/release/helloworld $out/helloworld.bin
+    ${binutils-riscv}/bin/riscv32-unknown-elf-objcopy -O binary target/riscv32imc-unknown-none-elf/release/helloworld $out/helloworld.bin
   '';
 }

overlay.nix

@@ -4,4 +4,7 @@ self: super:
     name = oa.name + "-riscv";
     cmakeFlags = oa.cmakeFlags ++ ["-DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=RISCV"];
   });
+  rustc = super.rustc.overrideAttrs(oa: {
+    patches = oa.patches ++ [ ./compilers/rustc-riscv32i.patch ];
+  });
 }